Every year, net-lease tenants get a statement comparing what they paid with what the property actually cost. Here is how to read it, when to act and where the mistakes usually hide.
A CAM reconciliation is a landlord’s annual true-up of common area maintenance (CAM) and other operating expenses. You pay monthly estimates all year. Afterward the landlord totals actual costs, applies your pro rata share and bills the shortfall or credits the overpayment. Errors are easiest to fix early, before the audit window closes.
Key takeaways
- A CAM reconciliation compares your monthly estimated payments with your share of the property’s actual costs for the year.
- Under the AIR multi-tenant net lease form, the landlord delivers the statement within 60 days after the tenant’s written request.
- Most errors come from the wrong pro rata share, capital costs charged all at once, fees calculated on the wrong base and excluded costs slipping in.
- Review windows in leases commonly run from 30 to 180 days after the statement, according to brokerage lease-audit guidance.
- Paying the balance generally does not waive audit rights, but withholding payment can create a default under the lease.
What are CAM charges?
CAM charges pay for running the shared parts of a property. In an industrial park that usually means the parking lot and truck courts, landscaping and irrigation, sweeping, exterior lighting, trash and the property manager’s fee. Many leases fold property taxes and insurance into the same pool. That is why tenants often say “CAM” when they mean all of their NNN (triple net) charges. For the basics of NNN, see NNN vs. modified gross vs. full service leases.
In a single-tenant building the tenant usually pays these costs directly, and there may be no reconciliation at all. In a multi-tenant building the landlord pays the bills and recovers each tenant’s share, which is where the year-end statement comes in. Our guide to operating expense pass-throughs covers what can be included in the first place. Gross leases handle rising costs differently, as base year and expense stop clauses show.
How does a CAM reconciliation work?
The cycle has four steps. The landlord budgets the year and sets a monthly estimate, which you pay with your rent. After year end the landlord totals actual costs and applies your share. The statement then shows a balance due or a credit.
The AIR Standard Industrial/Commercial Multi-Tenant Lease, Net (MTN), widely used in California, ties the timing to the tenant’s request. The landlord must deliver a reasonably detailed statement within 60 days after written request, no more than once a year. A shortfall is due within 10 days after delivery, and overpayments are credited against future payments, according to the AIR CRE form (November 2017 edition). Other leases set a fixed deadline for the landlord.
| Step | Typical timing | What to do |
|---|---|---|
| Budget and new estimate | Start of the year | Compare the new estimate with last year’s actuals |
| Statement request | Early in the year, if your lease requires a request | Send it in writing and keep proof of delivery |
| Statement delivered | Per lease (AIR MTN: within 60 days after request) | Log the date; your review window usually starts here |
| Balance due or credit | Per lease (AIR MTN: shortfall within 10 days) | Pay undisputed amounts on time; note objections in writing |
| Review or audit window | Commonly 30 to 180 days after the statement | Request backup and finish your review before it closes |
How do you review a CAM reconciliation?
Start with the lease, not the statement. The definitions, exclusions, caps and pro rata share in your lease decide what the landlord can charge. The statement only shows what it did charge. Then work through these checks.
- Pro rata share: confirm the percentage matches the lease and is based on the whole project, not only the leased space.
- Year-over-year changes: compare each line with last year and with the budget, and ask about any jump.
- Capital items: look for paving, roofs or equipment charged in full instead of amortized.
- Management and admin fees: check the percentage and the base it is calculated on.
- Excluded costs: look for financing, leasing commissions, legal fees and work done for other tenants.
- Property taxes: match the charge to the actual tax bills, check supplemental bills after a sale and confirm refunds were credited. Our Prop 13 reassessment guide explains why a sale can raise your share.
- Insurance: compare the premium with the prior year and with the coverage your lease requires.
- Caps and gross-ups: apply any cap on controllable expenses and confirm a gross-up touches only variable costs.
What are the most common CAM reconciliation errors?
Most errors are honest ones. They come from accounting software set up years ago, a new property manager or lease terms that were never loaded correctly. Brokerage lease-audit guidance notes that landlords tend to pass through capital expenses, costs from other properties and fees with minimal documentation, and sometimes keep tax refunds owed to tenants.
| Error | Example | How to spot it |
|---|---|---|
| Wrong pro rata share | One tenant-advisory example describes a tenant occupying 5% of a building billed at 7% | Divide your square feet by the project total in the lease |
| Capital cost expensed | A parking lot rebuild charged in one year | Look for large one-time repair lines |
| Fee on the wrong base | Management fee calculated on taxes and insurance | Recalculate the fee using the lease definition |
| Excluded or unrelated costs | Leasing commissions, legal fees, another property’s invoices | Ask for the general ledger and invoices |
| Tax issues | Missed refund or a supplemental bill charged twice | Compare with county tax bills for the period |
What should you do if you find an error?
Put your questions in writing and ask for backup: the general ledger, invoices and the tax and insurance bills. Many issues end at this stage. Brokerage lease-audit guidance notes that most leases require payment of the balance within 30 days and that paying does not waive audit rights. Pay undisputed amounts on time and reserve your objection in writing.
If the gap is large, consider a formal audit under your lease. Tenant-favorable audit clauses make the landlord pay the audit cost when the overcharge passes a threshold. Law firm Herrick, Feinstein suggests 3%, and Baker Burton & Lundy gives 5% as an example. If your lease has no audit clause, negotiate one at renewal, and see our guide on when to start your lease renewal. Withholding rent is risky, because a payment default can be costly.
What California rules affect CAM reconciliations?
Property taxes are the biggest line in most Kern County reconciliations, and they follow their own calendar. Secured tax bills are due in two installments, Nov. 1 and Feb. 1, according to the State Board of Equalization. A sale or new construction triggers supplemental assessments. A calendar-year statement must prorate those bills correctly.
For very small businesses, SB 1103 adds a documentation rule. Qualified commercial tenants, such as microenterprises, restaurants with fewer than 10 employees and nonprofits with fewer than 20, can request supporting documentation that the landlord must provide within 30 days, according to the California Lawyers Association. Most industrial tenants will not qualify, but small shops in Bakersfield business parks might.
What should landlords include with a reconciliation?
Owners recover more and argue less when the statement is easy to check. Include a line-item summary, the share calculation, the cap and gross-up math, and copies of tax and insurance bills. Well-supported reconciliations also make estoppel certificates cleaner when you sell or refinance, and clean expense recovery feeds directly into net operating income.
Worked example: reviewing a CAM reconciliation in an 80,000 SF Bakersfield industrial park
A tenant leases 12,000 SF in an 80,000 SF multi-tenant park, and its lease sets a 15% share. It paid estimates of $0.18 per SF per month, or $25,920 for the year. The landlord’s statement shows $190,000 in total expenses and bills a share of 17.14%, calculated on the 70,000 SF that was leased. That produces $32,571 and a balance due of $6,651.
On review, the tenant finds two problems. The share should be 15% under the lease. The total also includes a $36,000 parking lot reconstruction charged in full. Under an AIR-style 12-year amortization, only $3,000 belongs in this year. Corrected expenses are $157,000, the tenant’s share is $23,550, and the tenant is owed a $2,370 credit. All figures are illustrative, not local market data.
| Line | As billed | Corrected |
|---|---|---|
| Total project expenses | $190,000 | $157,000 |
| Tenant share | 17.14% (12,000 / 70,000) | 15.00% (12,000 / 80,000) |
| Tenant’s cost for the year | $32,571 | $23,550 |
| Paid in monthly estimates | $25,920 | $25,920 |
| Result | $6,651 balance due | $2,370 credit |
Frequently asked questions
How long does a landlord have to send a CAM reconciliation?
It depends on the lease. Some set a fixed deadline after year end. The AIR multi-tenant net form, common in California, gives the landlord 60 days after the tenant’s written request and allows one request a year. Under that form, the landlord’s clock starts with a written request each year, and proof of delivery fixes the date.
Do I have to pay a CAM reconciliation bill if I think it is wrong?
Usually you should pay the undisputed part on time and object in writing to the rest. Many leases demand payment quickly, and the AIR form allows 10 days. Paying generally does not waive audit rights. Withholding rent can put you in default, so speak with a real estate attorney first.
How far back can a landlord bill for missed CAM charges?
That depends on your lease and California law. Many leases set no limit, so a landlord could send a catch-up bill years later. Tenants often negotiate a sunset clause that bars charges billed after a set period. Herrick, Feinstein describes two years as standard.
What is a CAM audit, and when is it worth it?
A CAM audit is a detailed review of the landlord’s books behind your reconciliation, done under the audit clause in your lease. It pays off when your share is large, charges jumped without explanation or the building recently sold. The review window and who pays audit costs if an overcharge turns up both depend on the lease.
Can CAM charges include a new roof or parking lot?
Only if the lease allows it, and usually only in amortized form. The AIR form spreads capital improvements over 12 years, so the tenant pays no more than its share of 1/144th of the cost in any month. One big paving or roofing line on a single year’s statement stands out.
Why did my estimated CAM payments go up?
Landlords reset estimates each year from last year’s actual costs and the new budget. Typical causes are a tax increase after a sale, insurance renewals, deferred repairs coming due and higher utility or landscaping contracts.
If a CAM reconciliation on your Bakersfield or Kern County industrial space does not add up, Kern CRE can help you check it against your lease and decide whether a closer review is worth it. Call Kern CRE at 855-KERN-CRE (855-537-6273) or contact us. Get Kern County CRE news monthly: subscribe to the Kern CRE report.
Sources
- Standard Industrial/Commercial Multi-Tenant Lease, Net (MTN-26.10), AIR CRE, November 2017.
- The Top 5 Things to Know About Lease Audits, Cushman & Wakefield, January 2020.
- Can your business save money with a lease audit?, Cresa, undated.
- A Tenant’s Guide To Operating Expense Escalations, Herrick, Feinstein (via Law360), February 2013.
- Suggested Tenant Revisions To The AIR Standard Industrial/Commercial Multi-Tenant Lease, Net, Baker Burton & Lundy, March 2016.
- California Property Tax: An Overview (Publication 29), California State Board of Equalization, March 2025.
- New Protections for Qualified Commercial Tenants under CA SB 1103, California Lawyers Association, January 2025.
About this article
Kern CRE prepared this article with help from AI research and writing tools. An editor reviewed the draft, checked its facts against the sources linked above and edited it for accuracy and clarity. It is general information, not legal, tax, investment or financial advice; talk with a qualified professional about your situation.